William i



(No Model.)

W. I. B. McHALE.

TUBE EXPANDER.

No. 338,424. Patented Mar; 23, 1886.

INVEN TOR Q?'-7/wf WITNESSES I ATTORNEYS.

UNITED STATES PATENT OFFICE.

WILLIAM I. B. MOHALE, OF NEW YORK, N. Y.

TUBE-EXPANDER.

ESZ EGIFIGATION forming part of Letters Patent No. 338,424, dated March 23, 1886.

Serial No. 173,823. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM I. B. llICHALE, of the city, county, and State of New York, have invented a new and Improved Tube-EX- pander, of which the following is a full, clear, and exact description.

The object of my invention is to provide a new and improved device for expanding the ends of boiler-tubes, 83c.

The invention consists in the combination ofa tubular stock having longitudinal slots eX- tending from the rear end to within a short distance from the front, in which slots cylindrical swages or rollers are held by a flanged ring surrounding the rear end of the stock loosely.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of referenceindicate corresponding parts in all the figures.

Figure l is a longitudinal sectional elevation of my improved tube-expander. Fig. 2 is a front end view of the same. Fig. 3 is a crosssectional view of the same on the line x 00, Fig. 1.

The tubular stock A has three or more or less longitudinal slots, B, extending from the rear end to within a short distance from the front end of the stock, and are open at the rear end of the stock. Into said slots B the rollers or cylindrical swages O are placed, the diameters of which areless than the widths of the slots, so that the said rollers can easily pass entirely through the slots from the inside to the outside, and thus have considerable play. The rollers or swages have their ends cut off square, and have no guides, &c., whatever on their ends.

The stock A rests upon and is held at one 0 end against a circular plate, D, by screws E,

ing the end parts of the swages or rollers, prevents the swages or rollers from being removed entirely from the stock when the ring is on, as the distance from the outer surface of the stock A to the inner surface of the flange H is less than half the diameter ofa swage or roller, 0. The swages or rollers are thus free to turn in the slots in the stock, can be moved radially, and are prevented from leaving the stock entirely, but can easily be removed for readjustment, repair, 830., after the plate D and the ring G have been removed. The stock and its rollers or swages are passed into the end of the tube to be expanded, the lugs J overlapping the outside of the tube. A mandrel, L, is then passed through the bore of the stock: and forces the rollers 0 against the inside of the tube. The mandrel is then turned on its longitudinal axis, whereby the stock is turned on its longitudinal axis in the end of the tube and the rollers or swages are turned on their longitudinal axes. As the swages or rollers C have considerable play radially, the expander can be used advantageously for tubes of different diameters.

Having thus described my invention,l claim as new and desire to secure by Letters Patent- 1. In a tube-expander, the combination, with a stock having longitudinal slotsextending from the rear end of the stock to near the front end, of cylindrical swages or rollers in said slots and a flanged ring surrounding the stock and holding the swages in the stock, substantially as herein shown and described.

2. In a tube-expander,the co mbination,with

a stock having slots extending from the rear end to within a short distance from the front end, of cylindrical swages or rollers in said slots and a ring surrounding the rear end of the stock loosely and holding the swages or rollers in the slots of the stock, substantially as herein shown and described.

3. In a tube-expander,the combination, with a stock having slots extending from the rear end to near the front end, of the flanged ring G, surrounding the rear end of the stock loosely, and the plate D, held on the rear end of the stock and holding the ring G on the stock, substantially as herein shown and described.

WILLIAM I. B. MOHALE. [Ls] Vitnesses:

FERDINAND S. llTOHALE, RICHARD L. llIOHALE. 

